f *34 ] 
Exp. 2 6. An Englifh quart of the water being 
kept boiling for a quarter of an hour, it turned thick, 
muddy, and yellow, by the feparation of its ochrous 
parts ; and, being fet to cool in a clean bowl, the 
next day all the ochre was fubfided to the bottom, 
from which the water was carefully nltred : where- 
by it became almoft as clear and limpid as before 
the elixation, retaining a fharp aluminous tafte, but 
was deprived of the ftrong ferrugineous tafte, which 
it had at firfb. This water was again boiled j by 
which means it was again turned a little yellow, by 
the feparation of fome more ochre. It was there- 
fore again filtred, and rendered clear, and its alumi- 
nous tafte was Wronger than before. After this fil- 
tration, the water was evaporated in a fand-heat to ' 
about a fixteenth part of the original quantity, and 
then it tailed like a ftrong folution of alum joined 
with a frnall degree of a chalybeat tafte. And this 
being totally evaporated in a glafs, there adhered upon 
its fides a pure white fait ; and a larger quantity of 
the fame fait remained in the bottom of the glafs, 
which was not fo white, but more impure than the 
former, and of a brown colour. 
27. This fait, thus procured from the water, be- 
ing mixed with diftilled vinegar and fpirit of vitriol, 
there was not the leaft effervefcence produced. 
28. Some of the brown-coloured fait being put 
upon a red-hot iron, it did neither fparkle nor decre- 
pitate ; but was turned into a blackifh cineritious fub- 
ftance, which in a fhort time became a white calx. 
And tho’ fome of the fait was put upon the iron 
finely powdered, yet it concreted, and run together 
in a cinder, whole cohefion was afterwards deftroyed 
when calcined by a further degree of heat. 
29. As 
